The former Rangers defender has played for Liverpool only once this season, and has been dropped from the Scotland squad for this month's Euro 2012 qualifiers against Liechtenstein and Spain.
"There's nothing worse than not being able to go out on the pitch on a Saturday and play," he admitted.
"But I need to just keep my head down and hopefully I'll either get some game time at Liverpool or get the chance to go somewhere else and try and prove myself."
When asked about Liverpool's fortunes this season and whether they expect to be back in Europe next year, he added: "It just depends how the next couple of months go.
"You can be realistic, you can change your aims and where you want to be, but obviously the higher we finish the better.
"We want to get back in the Champions League, obviously, but first and foremost we need to make sure we're in a good position to do that."
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